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> New changeset 1bbedfb20932 by Victor Stinner in branch 'default':
> Issue #19421: fix a check in warnings.warn() to be able to use it during Python
> http://hg.python.org/cpython/rev/1bbedfb20932
Without this fix, the following script crashs with an assertion error (Objects/typeobject.c:740: type_call: Assertion `!PyErr_Occurred()' failed.):
-------------
import warnings
warn = warnings.warn
class A:
 def __del__(self):
 warn("bla")
a=A()
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